We are investigating latency spikes to our call servers. This may be affecting calls.
We're applying a software change which should fix this.
The call servers will be updated shortly - we're moving traffic between call servers and once free they will be updated.
We've swapped sip servers and so new registrations and calls should now be on the one that is fixed.
Normal service has resumed, we do apologise to customers who had some call quality issues today.